NodEO is an object-oriented JavaScript library, written originally for NodeJS, for implementing two kind of evoluitonary algorithms with several different fitness functions. Remarks: It includes scripts with asynchronous algorithms. Can be connected easily in distributed evolutionary algorithms experiments using client-server (Ajax) or Express. Standard-article: Juan-Julián Merelo, Pedro Castillo, Antonio Mora, Anna Esparcia-Alcázar, and Víctor Rivas-Santos ”NodEO, a multi-paradigm distributed evolutionary algorithm platform in JavaScript”